Rock-drill.



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PATENTED APR. 9, 1907.

ROCK DRILL. ArPLIoTIoN FILED uuml, 1905.

G. E. SHADALL.

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PATENTED APR. 9, 1907.

G. E. SHADALL. ROCK DRILL.

APPLICATION FILED MAB a1. 1905.

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UNITED sTnTns rnTnNT'orFron.

CHARLES E. SHADALL, OF MILWAUKEE, WISCONSIN, ASSIGNOR OF ONE- I-IALF TO FREDERICK L. HORNEFFER, OF MILWAUKEE, WISCONSIN.

ROCK-DRILL.

Specification of Letters latent.

Patented April 9, 1907.

Application filed March 31, 1905. Serial No. 253,018.

To H whom, t may concern:

Be it known that I, CHARLES E. SHDALL, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and. State of Wisconsin, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification, reference being had to the accompanying drawings, forming apart thereof.

The main objects of this invention are to produce a balanced portable machine furnished with a motor and suitable for mining or prospecting operations, and generally to improve the construction and operation of machines intendedifor this class of work.

It consists in certainnovel featuresofconstruction and in the peculiar arrangement and combinations of parts hereinafter particularly described, and pointed out in the claims.

In the accompanying drawings like letters designate the same parts in both figures.

Figure l is a vertical longitudinal section of a rock-drill embodying my invention. Fig. 2 is a plan view of the same, the crank-case and inner ends of the cross-head guides being broken away and shown in horizontal section.

a, designates the crank-case, formed or provided in the ends with j ournal-bearings l), in which the crank-shaft c is mounted. The crank-shaft has three cranks d and e c, the middle crank d being opposite and somewhat longer than the cranks e. To opposite sides ofthe crankcase are attached at right angles to the crank-shaft and in line with each other cylindrical guides f and g. In the guidef is fitted a reciprocating cross-head composed of end pieces h, connected by guide-rods i, an intermediate thrust-bearing j, movably mounted on said rods, and spiral springs 7c, interposed between the thrust-bearing and the end pieces of the cross-head and normally holding said thrust-bearing midway between the end pieces. This cross-head is connected by two rods or pitmen Z with the cranks e e. l

mis the drill-shaft, fitted to turn at its inner end in a central sleeve or box of the thrust-bearing, in which it is held against endwise movement by a collar and nut. It is provided at its outer end with a drill holder or chuck n and has a guiding bearing in the head of the guide It is formed with spiral:

man g with the crank d, To the outer end of the guide g the cylinder r of a reciprocating explosive-engine is attached, and the piston s of the engine is directly connected by its rod with the cross-head p. The cross-head p and piston s are made to counterbalance the cross-head at the other end of the machine to rwhich the drill is attached.

Other forms ofexplosive-engines or motors may be employed to turn the crank-shaft and may be arranged and connected with the crank-shaft in various ways. In case the engine or motor is not attached to the end of the guide g and connected with the crankshaft through the cross-head p the weight of said cross-head will be correspondingly 1ncreased to 'counterbalance the cross-head on the-opposite side of the crank-shaftl To prevent fouling the air in a mine, shaft,

tunnel, or the like, for work in which this machine is specially designed, and to admit of the employment of a gas or oil engine for operating the drill, the hot spent gases discharged from the engine are conducted from the engine to a waste-pipe leading to theA mouth of the mine, shaft, or tunnel through a rubber hose or fiexible pipe t, which permits the machine to be advanced or changed in position as the work progresses without disturbing the exhaust connection of the eneine. C To admit of conducting off the exhaust from the engine through a rubber hose without destroying or injuring the hose, the spent gases have to be cooled down as they are discharged from the engine, and for this purpose a cooler u is interposed between the hose t and the exhaust-port of the engine. This cooler is provided inside with alternating bafe-plates and on the outside with a jacket through which water or other suitable cooling medium is circulated.

A rotary pump e, mounted on one end of the crank-case c and driven by the crankshaft, is connected by hose or pipes 'w and x with the cooling-jacket y of the engine-cylinder and with the jacket of the cooler a, which is connected in turn with the jacket y, so that the pump will cause the water or other cooling medium' to flow through and from one jacket to and through the other. To reduce the temperature of the water or other cooling medium in case it is continuously circulated through the pump by means of connections like or similar to those shown in the drawings, a coil or other form of radiator is interposed between the pump and the return-pipe or hose It will be understood that the machine is to be mounted on a tripod or supportingframe provided with a screw for advancing it to and withdrawing it from its work, like or similar to those employed with this class of drills.

The machine operates as follows: The inotor, 'which in the present case is a two-cycle gas or oil engine, being started, the crankshaft is turned, and the cross-heads connected therewith are moved simultaneously in opposite directions, alternately approaching and receding from each other, so that the equilibrium or balance of the machine which is centrally supported on the tripod or frame is preserved while the machine is in 'action` The shock of the blows struck by the drill with the outward strokes of the shaft m or the recoil of the drill is received by the spring between the inner end piece h and the thrustbearing and thus prevented from breaking or injuring the machine. The springs bctween the end pieces and thrust-bearing of the cross-head with which the drill is connected also allow for variation in the stroke of the drill.

While the machine is at work, the pump c circulates the water or other medium used to cool the engine-cylinder and the spent gases discharged therefrom through the jacket y, the jacket of the cooleru, and the radiator z, so that such spent gases may be conducted off through the fiexible hose t without injury thereto and without contaminating the air in the vicinity of the machine.

Various changes in the details of construction and in the arrangement of the component parts of the machine may be made without materially affecting its operation and' without departing from the principle and intended scope of the invention.

I claim- 1. In a rock-drill the combination of a frame provided with journal-bearings and with guides arranged transversely to said bearings, a crank-shaft mounted in said bearings and provided with oppositely-directed cranks, reciprocating cross-heads connected with opposite cranks and tending to counterbalance each other as they are moved simultaneously in opposite diections, and a drilloperating shaft connected with one of said cross-heads, substantially as described.

2. In a rock-drill the combination of a frame provided with journal-bearings and with guides arranged transversely to said bearings7 a crank-shaft mounted in said bearings and having oppositely-directed cranks, counterbalancing heads carried by said guides and connected with said cranks, and a drill-holder movably mountedA in said frame in line with one of said heads which is adapted to impart endwise impulses thereto, substantially as described.

.l'n a rock-drill the combination of a crank-case provided at the ends with journalbearings and on opposite sides with guides arranged in line with each other, a crank-A shaft mounted in said bearings and having oppositelydirected cranks, reciprocating cross -heads carried by said guides and connected with said cranks, a drill-operating shaft revolubly connected with one of said heads, and means for turning said shaft in said head when it is reciprocated therewith, substantially as described.

4. In a rock-drill tlie combination of a crank-case provided with journal-bearings and with guides projecting from opposite sides thereof; a crank-shaft mounted in said bearings and having opposite cranks; a crosshead carried by one of said guides and connected with one of said cranks, said crosshead comprising end pieces connected by guide-rods, a thrust-bearing mounted on said guide-rods, and springs interposed between said end pieces and thrust-bearing; a drilloperating shaft connected with said thrustbearing; and a counterbalancing cross-head carried by the other guide and connectedwith the other crank, substantially as described.

In a rock-drill the combination of a crank-case provided with journal-bearings and with guides projecting in opposite directions therefrom; a crank-shaft mounted in said hearings and provided with opposite cranks; a cross-head carried by one of said guides and connected with one of said cranks, said cross-head comprising end pieces connected by guide-rods, a thrust-bearing movable on said rods, and springs interposed between said end pieces and thrust-bearing; a drill-operating shaft revolubly connected at one end with said thrust-bemin(r and provided at the other end with a driIl-holder; a nut confined in the associated guide for turning said drill-shaft; and a counterbalancing cross-head carried by the other guide and connected with the other crank, -substantially as described.

6. In a rock-drill the combination of a crank-case provided in the ends with journalbearings and on opposite sides with cylindrical guides; a crank-shaft mounted in said bearings and having three cranks, the middle crank being opposite the other two; crossheads fitted in said guides and connected one with the middle crank and the other with the two ofiwter cranks; and a drill-operating shaft IOO connected With one ofsaid cross-heads which the other tends to counterbalance, substantially as described.

7. In a-rock-drill the combination of a 5 crank-case provided with journal-bearings and on opposite sides with guides; a crank-- shaft mounted in said bearings and having opposite cranks; cross-heads carried by said guides and connected with said cranks; a 1.o drill-operating shaft revolubly connected with one of said cross-heads which the other tends to counterbalance; and a motor mounted with said crank-case and guides for turning said shaft, substantially as described.

i 5 8. In a rock-drill the combination. of a crank-case provided with journal-bearings and on opposite sides With guides at right angles to said bearings; a crank-shaft mounted in said bearings and provided with oppozo site cranks; cross-heads carried by said guides and connected With said cranks; a reciprocating motor comprising a cylinder attached at one end to the outer end of one of said guides and a piston connected with the l associated cross-head; and a drill-operating shaftrconnected With the other cross-head, substantially as described.

9. In a rock-drill the combination of a frame provided With journal-bearings and 3o with guides arranged transversely to said bearings, a crank-shaft mounted in said bearings and provided With oppositely-directed cranks, counterbalancingdicads mounted on said uides and connected with said cranks;

3 5 a dril -holder movably mounted in said frame in line with one of said heads Which is adapted to impart cndwise impulses thereto, and

a motor mounted on said frame .and connected With said crank-shaft, substantially as described. v

10. In a rock-drill the combination of a frame provided With journal-bearings and with guides arranged transversely to said bearings, a crank-shaft mounted in said bea'rings and provided with oppositely-directed cranks, counterbalancing-heads mounted on said guides and connected with said cranks, a drill-holder rcvoluble and movable endwise in said frame in line with one of said heads which is adapted to impart endxvise impulses thereto, means for intermittently turning said drill-holder, and a motor mounted on said frame and connected with said crankshaft, substantially as described.

1l. In a rock-drill the combination of a frame provided with crank-bearings and With guides arranged transversely to said bearings, oppositely-dirccted cranks journaled in said bearings, counterbalancing-heads mounted on said guides and.. connected with said cranks, and a reciprocating drill-holder mounted in said frame in line With one of said heads Which is adapted to impart end- Wise impulses thereto, substantially as described.

In Witness whereof I hereto affix my signature in presence of two Witnesses.

CHARLES E. SHADALL.

Iitnessesz CHAs. L. Goss, BERNARD C. ROLOFF. 

